Everything you've just said is why it'll blow up in their faces, and Facebook will start the uncomfortable process of announcing year on year losses of users.
They're essentially duplicating Twitter's mistakes, and not recognizing they were mistakes. Some years ago, Twitter decided to keep tweaking their service. @ replies were hidden. Trending Topics was no longer annotated. Then oodles of JS was added to their service, making it clumsy and unreliable.
Then came the real killers, images and previews. We went, overnight, from a service where everyone saw 15-20 tweets on their screens, enough to follow a conversation, to a situation where most can only see 3-5. Remember, we're talking about 140 characters of actual content per tweet here. The 3-5 was because lots of tweets would now include the headline of the article they're linking to (which would typically ALSO be in the tweet message itself), and because tweets would now frequently have images attached and have a honking great big preview there.
The people who liked Twitter suddenly found that the giant conversation part of it no longer existed. They started to bleed off. The people who used Twitter to follow celebrities continued to use it, but had no great incentive to stay.
More recently, we've seen bizarre attempts to implement message threading that were worse than the clumsy hacks we'd seen before, and even randomizing - sorry, algorithmically reorganizing the timelines.
And so Twitter started to suffer serious churn. Because it added features that nobody had asked for, nobody wants, and that harm the service for end users.
Who is asking for autoplaying videos? Who is asking for autoplaying SOUND attached to those videos? Who is asking for messages to be sorted into a semi-random order? Who asked for videos in the first place?
Nobody. People will leave Facebook. Not immediately. But give it two years, and you'll start to see the first signs their membership is over the peak, and beginning the descent to has-been website status.